New Denial of Service Attack on Panix

Wed Oct 2 22:13:05 UTC 1996

Tim Bass writes:
> 
> Thanks for pointing out that the UNREACHABLE could just
> be hosts that are turned off.  The difficult case,
> now that you mention it, are the UNREACHABLEs due
> to a route flap or other intermediate system blip.

A host being down is _not_ necessarily an UNREACHABLE host. In most
cases you won't see _anything at all_ if a host on an ethernet is down.
A smart router might detect a chronically unresolved ARP and produce an
ICMP_UNREACH, but do you know about routers like that?

> Tim

Dima